[1] Hosp Lithuanian Univ Hlth Sci, Med Acad, Dept Surg, Eiveniu 2, LT-50009 Kaunas, Lithuania
[2] Lithuanian Univ Hlth Sci, Med Acad, Dept Gastroenterol, Kaunas, Lithuania
[3] Univ Gothenburg, Sahlgrenska Acad, Inst Clin Sci, Dept Gastrosurg Res & Educ, Gothenburg, Sweden